JP4376263B2 - Optical wavelength multiplexing system - Google Patents

Abstract

An optical wavelength multiplexing system includes transmission-side and reception-side optical wavelength multiplexers, and terminal devices, which are connected to each other by optical fiber cables. Optical wavelength converters in the transmission-side optical wavelength multiplexers are connected to ports respectively. The optical wavelength converter converts an input optical signal into an arbitrary preset wavelength to generate a converted optical signal. The port has a predetermined wavelength preset therein. Each optical power level of input converted optical signals is compared with each optical power level of optical signals of respective wavelengths set in the ports. When a difference is detected in the comparison result, it is determined that an optical wavelength converter is incorrectly connected to the port.

Description

  In the present invention, a plurality of optical wavelength conversion units that convert an input optical signal to an arbitrary wavelength set in advance to generate a converted optical signal are connected to a plurality of ports in which a predetermined wavelength is set in advance. An optical wavelength multiplexing system that generates and transmits a multiplexed optical signal obtained by multiplexing the converted optical signals generated by a plurality of optical wavelength converters and separates the received multiplexed optical signal for each predetermined wavelength About.

  Conventionally, with the spread of the Internet, transmission of high-capacity data such as images and moving images has been frequently performed. In order to transmit such high-capacity data at high speed, a network line using xDSL technology (x Digital Subscriber Line) that realizes high-speed network communication is generally used in many cases. An optical network such as FTTH (Fiber To The Home) using an optical fiber cable as a network is also used.

  As a technique for effectively using such an optical fiber cable, attention is paid to WDM (Wavelength Division Multiplex). This WDM is a technique for expanding the transmission capacity of an optical fiber cable by transmitting a plurality of signals having different wavelengths on a single optical fiber cable, that is, by simultaneously using a plurality of optical signals having different wavelengths.

  In an optical wavelength multiplexing system equipped with an optical add / drop multiplexer (OADM) that inserts an optical signal of an arbitrary wavelength using this WDM and branches and receives the optical signal, the optical signal is transmitted to a plurality of ports. Assign frequencies individually. Each port is connected to an optical wavelength converter that converts (outputs) the input optical signal into an optical signal having an assigned frequency.

  That is, it is necessary to connect to each port without making a mistake in the optical wavelength converter that outputs the assigned frequency. However, in recent years, since the number of optical wavelengths to be multiplexed in OADM has increased, OADM has many ports, and the wavelength assigned to each port is different from the wavelength that can be multiplexed by optical wavelength division multiplexing. Connecting optical wavelength converters for output (misconnection) frequently occurs. Therefore, various techniques for detecting such an erroneous connection have been disclosed.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 2004-32088) discloses a technique for detecting an erroneous connection by using an arrayed waveguide grating (AWG) having wavelength dependency when combining optical wavelengths. Yes. Specifically, since the AWG has wavelength dependency, when an optical signal having a wavelength different from the wavelength assigned to each port is input, the AWG has a characteristic of not allowing the optical signal to pass therethrough. By using this characteristic, the optical power level of each port of the AWG to which the wavelength is assigned is compared with the optical power level obtained by multiplexing and branching the optical signal of each wavelength input through each port. Detecting misconnections. In other words, if there is an erroneously connected port, an error occurs between the optical power level before multiplexing and the optical power level after multiplexing (after multiplexing). Is detected.

JP 2004-32088 A

  By the way, in patent document 1 which is the above-mentioned prior art, since an arrayed waveguide grating (AWG) is very expensive, there is a problem that the cost becomes high for constructing such an optical wavelength multiplexing system. .

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and can detect an erroneous connection and can reduce the cost for system construction. It aims to provide a multiple system.

In order to solve the above-described problems and achieve the object, the present invention includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal. A predetermined wavelength is connected to a plurality of ports set in advance, and a multiplexed optical signal obtained by multiplexing the converted optical signals generated by the plurality of optical wavelength converters is generated and transmitted. An optical wavelength multiplexing system that separates an optical signal for each predetermined wavelength, and is connected to each of the plurality of ports and detects a plurality of second optical power levels of the converted optical signals input to the ports. An optical power level detecting unit, an optical signal multiplexing unit that multiplexes all the converted optical signals input from the plurality of ports to generate a multiplexed optical signal, and the plurality of ports. A plurality of input means for inputting the converted optical signal input to each port to the optical signal multiplexing means, and until the converted optical power level is detected by the first optical power level detecting means, The input means is controlled so as not to input the converted optical signal to the optical signal multiplexing means, and the converted optical power level is detected by the first optical power level detecting means. Input control means for controlling the input means so as to input an optical signal to the optical signal multiplexing means, and optical power after multiplexing at a predetermined wavelength set in each port from the multiplexed optical signal Second optical power level detection means for detecting the level, converted optical power level detected by the first optical power level detection means, and detected by the second optical power level detection means. When the optical power level after multiplexing is compared and there is a difference in the comparison result, the optical wavelength conversion unit that converts the wavelength to a wavelength different from the predetermined wavelength set in each port is erroneously connected. And an erroneous connection detecting means for detecting that the connection is detected.

The present invention further includes an optical branching unit that branches the multiplexed optical signal multiplexed by the optical signal multiplexing unit in the above invention, wherein the second optical power level detection unit includes the optical branching unit. The optical power level after branching of a predetermined wavelength set in each port is detected from the multiplexed optical signal branched by the means, and the erroneous connection detecting means is detected by the first optical power level detecting means. The optical power level after conversion is compared with the optical power level after branching detected by the second optical power level detection means. It is detected that an optical wavelength conversion unit for converting to a wavelength different from a predetermined wavelength to be set is erroneously connected.

Further, the present invention is the above invention, wherein the erroneous connection detection means is a unit that receives the multiplexed optical signal after the received multiplexed optical signal is separated for each predetermined wavelength in the multiplexed optical signal receiving side device. The optical power level is received, the received optical power level after reception is compared with the converted optical power level detected by the first optical power level detecting means, and there is a difference in the comparison result. In this case, it is detected that an optical wavelength conversion unit for converting to a wavelength different from a predetermined wavelength set for each port is erroneously connected.

Further, the present invention provides the post-conversion light for the input means connected to the port when the erroneous connection is detected by the erroneous connection detection means. Control is performed so as not to input a signal to the optical signal multiplexing means.

Further, according to the present invention, in the above invention, when the erroneous connection detecting means detects the erroneous connection, the erroneous connection is searched for the predetermined wavelength set for each of the plurality of ports, and the erroneous port is detected. A normal connection destination port of the connected optical wavelength conversion unit is detected.

According to the present invention, the optical power levels of the converted optical signals connected to each of the plurality of ports are detected, and all the converted optical signals input from the plurality of ports are multiplexed and multiplexed. Generates an optical signal, is provided at multiple ports, inputs the converted optical signal input to each port, and controls not to input the converted optical signal until the converted optical power level is detected When the converted optical power level is detected, control is performed so that the converted optical signal is input, and the multiplexed optical power level of a predetermined wavelength set for each port is determined from the multiplexed optical signal. And the detected optical power level after conversion is compared with the detected optical power level after multiplexing. Light converted to a wavelength different from the wavelength And detects the long conversion unit are erroneously connected, together it is possible to detect an erroneous connection, it is possible to reduce the cost of system construction.

  For example, it is possible to detect a port misconnection using an optical switch as an input means and an optical coupler (CPL) as an optical signal multiplexing means. As a result, an erroneous connection using an expensive arrayed waveguide grating (AWG) is possible. It is possible to reduce the cost for system construction as compared with the case of detecting. Furthermore, without stopping the system, it is possible to reconnect the misconnected optical fiber cable to the correct connection destination or change the port settings according to the wavelength transmitted to the optical fiber cable. .

Further, according to the present invention, the multiplexed optical signal is branched, and the optical power level after branching of a predetermined wavelength set in each port is detected from the branched multiplexed optical signal, and the detection is performed. When the converted optical power level and the detected optical power level after branching are compared, and there is a difference in the comparison result, the wavelength is different from the predetermined wavelength set for each port. Since it detects that the optical wavelength converter to be converted is misconnected, it can detect the misconnection in the optical wavelength multiplexing system on the transmission side, which can further reduce the cost of system construction. is there.

  For example, when an optical switch is used as the optical signal switching means and an optical coupler (CPL) is used as the optical signal multiplexing means, an optical signal having a wrong wavelength is also multiplexed due to erroneous connection. By detecting an erroneous connection in the optical wavelength multiplexing system on the transmission side before transmission, it is possible to further reduce the cost for system construction, and the multiplexed optical signal and the optical wavelength multiplexing system It is possible to prevent quality degradation of the product.

Further, according to the present invention, in the multiplexed optical signal receiving side apparatus, after receiving the received optical power level after the received multiplexed optical signal is separated for each predetermined wavelength, and after receiving Optical wavelength conversion that compares the optical power level with the detected optical power level after conversion, and if there is a difference in the comparison result, converts it to a wavelength different from the predetermined wavelength set for each port Since it is detected that the part is erroneously connected, it is possible to detect the erroneous connection and to further reduce the cost.

  For example, the received multiplexed optical signal generally used in the optical wavelength multiplexing system is separated, the separated optical power level detected for each separated wavelength is received by feedback, and the erroneous connection is detected. As a result of not having to add a new function to a normal optical wavelength multiplexing system, the cost can be further reduced.

In addition, according to the present invention, when a misconnection is detected, control is performed so that the converted optical signal is not input, so that it is possible to prevent quality degradation of the multiplexed optical signal and the optical wavelength multiplexing system. Is possible.

  For example, it is possible to transmit a multiplexed optical signal with higher quality when multiplexing is performed with a constant optical power level compared to multiplexing wavelengths with different optical power levels.

Further, according to the present invention, when an erroneous connection is detected, a predetermined wavelength set in each of the plurality of ports is searched, and a normal connection destination port of the optical wavelength conversion unit erroneously connected to the port As a result, it is possible to prevent mixing of optical signals having wavelengths that are input in error when multiplexing, and as a result, it is possible to prevent quality degradation of the multiplexed optical signals and the optical wavelength multiplexing system. Is possible.

  For example, when an optical switch or a VOA (Variable Optical Attenuator) is used as the optical signal switching means, an optical signal having an erroneously input wavelength also passes through the optical switch, and an erroneous optical signal is transmitted by the optical signal multiplexing means. In order to multiplex in the mixed state, the optical signal switching means connected to the erroneously connected port is set to the stop state, so that the light of the wavelength that is erroneously input when multiplexing is used. As a result of preventing signal mixing, it is possible to prevent quality degradation of the multiplexed optical signal and the optical wavelength multiplexing system.

  Exemplary embodiments of an optical wavelength multiplexing system according to the present invention will be described below in detail with reference to the accompanying drawings. The main terms used in the following embodiments, the outline and features of the optical wavelength multiplexing system according to the first embodiment, the configuration and processing procedure of the optical wavelength multiplexing system according to the first embodiment, and the effects of the first embodiment are sequentially described. Subsequently, another embodiment will be described.

[Explanation of terms]
First, main terms used in this embodiment will be described. The “optical wavelength multiplexing system” used in the present embodiment is a system that realizes an optical communication network, and includes a transmission side optical wavelength multiplexing device and a reception side optical wavelength multiplexing device. It is a system that expands the transmission capacity of an optical fiber cable by transmitting a plurality of signals having different wavelengths on a connected optical fiber cable, that is, by simultaneously using a plurality of optical signals having different wavelengths. The “optical wavelength multiplexing system” corresponds to the “optical wavelength multiplexing system” recited in the claims.

  Here, “transmission-side optical wavelength multiplexing device” and “reception-side optical wavelength multiplexing device” will be described. “Transmission-side optical wavelength multiplexing device” converts an optical signal input from a terminal device into an “optical wavelength conversion unit”. After converting the optical signal to an arbitrary wavelength by the optical wavelength multiplexing unit, the optical signal multiplexed in the transmission optical amplification unit is amplified to a transmittable optical level, Transmit to the receiving side optical wavelength division multiplexer.

  The “receiver-side optical wavelength multiplexer” amplifies the deteriorated multiplexed optical signal transmitted from the transmitter-side optical wavelength multiplexer by the “receiver optical amplifying unit”, and the “optical wavelength demultiplexing unit” The signal is separated into a predetermined wavelength before multiplexing, and the separated optical signal is converted back to the original optical signal by the “optical wavelength conversion unit” and transmitted to the terminal device.

  The “optical wavelength multiplexing unit” of the “transmission side optical wavelength multiplexing device” and the “optical wavelength separation unit” of the “reception side optical wavelength multiplexing device” are each connected to a plurality of “optical wavelength conversion units”. Has a port. The input wavelength is set in advance for each port, and the “optical wavelength converter” connected to the port performs conversion in advance so as to convert the wavelength to the wavelength set in the connection destination port. Wavelength is set. In this way, the transmission side optical wavelength multiplexing device receives and multiplexes and transmits the optical signal converted into a predetermined wavelength, and the reception side optical wavelength multiplexing device transmits the multiplexed optical signal. Is converted into an optical signal of the original wavelength to obtain an optical signal. However, even if an optical signal having a wavelength different from the wavelength set for the port is input, the transmission side optical wavelength multiplexing device multiplexes and transmits the optical signal, but the reception side optical wavelength multiplexing device When the optical signal is received and separated, there occurs a problem that it cannot be separated normally.

  In this embodiment, for the sake of convenience, description will be given separately for the transmission side optical wavelength multiplexing device and the reception side optical wavelength multiplexing device, but the present invention is not limited to this, and the reception side described in this embodiment will be explained. The optical wavelength multiplexing system may transmit the multiplexed optical signal, and the device that multiplexes and transmits the optical signal is the transmitting-side optical wavelength multiplexing device, and the device that receives the multiplexed optical signal. Becomes the receiving side optical wavelength multiplexing device.

  The “terminal device” is a device that transmits an optical signal to an optical wavelength multiplexing system and receives an optical signal from the optical wavelength multiplexing system. Specifically, it is connected to an optical wavelength converter that converts an optical signal to an arbitrary wavelength set in advance. Then, the optical signal transmitted by the terminal device is converted into an arbitrary wavelength by the optical wavelength conversion unit and input to each port of the transmission side optical wavelength multiplexing device.

[Outline and features of optical wavelength multiplexing system]
Next, the outline and features of the optical wavelength multiplexing system according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the outline and features of the optical wavelength multiplexing system according to the first embodiment.

  As shown in FIG. 1, this optical wavelength multiplexing system includes a transmission side optical wavelength multiplexing device, a reception side optical wavelength multiplexing device, and a terminal device that are communicably connected via an optical fiber cable. The transmission side optical wavelength multiplexing device includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal, and a predetermined wavelength is set in advance. Connected to multiple ports.

  Specifically, wavelengths λ1 to λ3 are set for ports A to C, respectively. The port A in which the wavelength λ1 is set is connected to an optical wavelength conversion unit that converts the input optical signal into an optical wavelength of the wavelength λ1. In addition, an optical wavelength conversion unit that converts an input optical signal into a wavelength λ3 is connected to the port B in which the wavelength λ2 is set. In other words, the port B must be set with an optical wavelength converter for converting to the wavelength λ2, but here, the optical wavelength converter for converting to the wavelength λ3 is erroneously connected.

  Under such a configuration, the optical wavelength multiplexing system according to the first embodiment generates a multiplexed optical signal obtained by multiplexing the converted optical signals generated by the plurality of optical wavelength conversion units as described above. In addition to transmitting, the outline is to separate the received multiplexed optical signal for each predetermined wavelength. In particular, it is possible to detect erroneous connections and reduce the cost of system construction. The main feature is that this is possible.

  This main feature will be described in detail. The transmission-side optical wavelength conversion multiplexing device inputs so that the input unit does not input the converted optical signal to the optical multiplexing unit until the converted optical power level is detected. Control part. Then, the optical wavelength conversion unit of the transmission-side optical wavelength multiplexing device that has received the optical signal transmitted by the terminal device 1 converts the optical signal into an optical signal having the wavelength λ1, and sends the converted optical signal to the port A. (See (1) and (2) in FIG. 1).

  Then, the transmission side optical wavelength multiplexing device detects the optical power level of the converted optical signal input to each port (see (3) in FIG. 1). Specifically, the optical power level detection unit 1 of the transmission-side optical wavelength multiplexing device detects the optical power level of the converted optical signal having the wavelength λ1 input to the port A.

  Subsequently, when the optical power level after conversion is detected, the transmission-side optical wavelength multiplexing device controls the input unit so that the input unit inputs the converted optical signal to the optical multiplexing unit ((( 4)). Specifically, in the above example, when the optical power level after conversion input to port A is detected, the input control unit of the transmission-side optical wavelength multiplexing device detects the converted optical signal as an optical signal. The input unit 1 is controlled so as to input to the multiplexing unit.

  The transmission-side optical wavelength multiplexing device inputs the converted optical signals input to each port to the optical multiplexing unit, multiplexes all the converted optical signals input from a plurality of ports, and multiplexes the optical signals. (See (5) and (6) in FIG. 1). Specifically, in the above example, the transmission-side optical wavelength multiplexing device inputs the converted optical signal converted to the wavelength λ1 input to the port A to the optical multiplexing unit, and the transmission-side optical wavelength multiplexing device The optical multiplexing unit multiplexes all input converted optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the transmission optical amplification unit.

  Thereafter, the transmission side optical wavelength multiplexing device branches the multiplexed optical signal multiplexed by the optical multiplexing unit, and branches the predetermined wavelength set to each port from the branched multiplexed optical signal. The optical power level is detected (see (7) and (8) in FIG. 1). Specifically, in the above example, the optical branching unit of the transmission side optical wavelength multiplexing device branches the multiplexed optical signal multiplexed by the optical multiplexing unit, and detects the optical power level of the transmission side optical wavelength multiplexing device. The unit detects the optical power level after the branching of the wavelength λ1 set in the port A from the branched multiplexed optical signal.

  Then, the transmission side optical wavelength multiplexing device compares the detected optical power level after conversion with the detected optical power level after branching, and if there is a difference between the comparison results, It is detected that the optical wavelength conversion unit for converting to a wavelength different from the predetermined wavelength to be set is erroneously connected (see (9) in FIG. 1). Specifically, in the above example, the erroneous connection detection unit of the transmission side optical wavelength multiplexing device is multiplexed by the multiplexing unit with the converted optical power level converted into the wavelength λ1 input to the port A. The multiplexed optical signal is branched, and the optical power level after multiplexing the wavelength λ1 set in the port A from the branched multiplexed optical signal is compared. Subsequently, the transmission-side optical wavelength multiplexing device has two optical signals whose optical power levels of the detected optical power level after conversion and the optical power level after branching are converted into the wavelength λ1, so that It is determined that there is no difference in the optical power level, and the optical wavelength conversion unit that converts the optical signal into the wavelength λ1 is normally connected to the port A in which the wavelength λ1 is set.

  Similar to the above-described method, when an optical signal is transmitted from the terminal device 2, the transmission-side optical wavelength multiplexing device determines whether or not the optical wavelength conversion unit 2 to which the terminal device 2 is connected is erroneously connected. To do.

  More specifically, the optical wavelength conversion unit of the transmission-side optical wavelength multiplexing device that has received the optical signal transmitted by the terminal device 2 converts the optical signal into an optical signal having the wavelength λ3 and converts the optical signal to the port B. The rear optical signal is output, and the optical power level of the converted optical signal having the wavelength λ3 input to the port B is detected (see (10) to (12) in FIG. 1).

  Thereafter, when the converted optical power level is detected, the transmission side optical wavelength multiplexing device controls the input unit 2 so that the input unit 2 inputs the converted optical signal to the optical multiplexing unit, The converted optical signal input to port B is input to the optical multiplexing unit, all the converted optical signals input from port A and port B are multiplexed to generate a multiplexed optical signal, and optical multiplexing is performed. 1 divides the multiplexed optical signal multiplexed by the unit, and detects the optical power level after the branching of the wavelength λ2 set in the port B from the branched optical signal after branching ((13) to FIG. 1). (See (17)).

  Then, the erroneous connection detection unit of the transmission side optical wavelength multiplexing device compares the detected optical power level after conversion with the detected optical power level after branching, and there is a difference in the comparison result In addition, it is detected that an optical wavelength converter that converts the wavelength to a wavelength different from the wavelength λ2 set in the port B is erroneously connected (see (18) in FIG. 1).

  Specifically, the erroneous connection detection unit of the transmission side optical wavelength multiplexing device includes the optical power level after conversion converted to the wavelength λ3 input to the port B, and the multiplexed optical signal multiplexed by the multiplexing unit. And the optical power level after the branching of the wavelength λ2 set in the port B is compared from the branched multiplexed optical signal, and the optical power levels of different wavelengths are detected. Thus, the difference between the two optical power levels is detected. Then, the erroneous connection detection unit of the transmission side optical wavelength multiplexing device detects that the optical wavelength conversion unit that converts to a wavelength different from the wavelength λ2 set in the port B is erroneously connected.

  In the above-described example, the case where the erroneous connection is detected from the optical signal input to the port B after the erroneous connection is detected from the optical signal input to the port A has been described. However, the present invention is not limited to this. Instead, the erroneous connection may be detected from the optical signals input to the ports A and B at the same time.

  As described above, the optical wavelength multiplexing system according to the first embodiment includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal. When generating and transmitting a multiplexed optical signal that is connected to a plurality of ports whose wavelengths are set in advance and multiplexed by a converted optical signal generated by a plurality of optical wavelength converters, as described above. In addition, it is possible to detect erroneous connections and to reduce the cost for system construction.

[Configuration of optical wavelength division multiplexing system]
Next, the configuration of the optical wavelength multiplexing system shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a block diagram illustrating the configuration of the optical wavelength multiplexing system according to the first embodiment. As shown in FIG. 2, the optical wavelength multiplexing system includes a transmission side optical wavelength multiplexing device 10 and a reception side optical wavelength multiplexing device 70.

(Configuration of transmitting side optical wavelength multiplexing device 10)
The transmission-side optical wavelength multiplexing device 10 includes a storage unit 11, optical wavelength conversion units 12 to 14, an optical wavelength multiplexing unit 20, a transmission optical amplification unit 40, an optical spectrum monitoring unit 50, and an optical level monitoring control unit 60. It consists of.

  The storage unit 11 stores wavelengths set in ports A21 to C23 described later. Specifically, as shown in FIG. 3, “port A, λ1”, “port B, λ2”, “port C, λ3” as “port number for specifying a port and“ wavelength ”for setting wavelength”. And so on. FIG. 3 is a diagram illustrating an example of information stored in the storage unit.

  The optical wavelength converters 12 to 14 convert the input optical signals that have been input into arbitrary wavelengths set in advance. Specifically, the optical wavelength converters 12 to 14 are set in advance as wavelengths to be converted by a user or the like as λ1 or λ2, and the wavelength (λ1 or λ2 or the like) in which the input input optical signal is set. To the wavelength of. For example, the wavelength λ1 is set in the optical wavelength converter 12, the wavelength λ3 is set in the optical wavelength converter 13, and the wavelength λ2 is set in the optical wavelength converter 14. ing.

  The optical wavelength multiplexing unit 20 includes ports A21 to C23, PDs 24 to 26, optical switches 27 to 29, and an optical coupler 30 as those closely related to the present invention. -14 to generate a multiplexed optical signal obtained by multiplexing the converted optical signals input to the respective ports, and perform various controls to be transmitted to the transmission optical amplification unit 40 described later.

  The ports A21 to C23 have predetermined wavelengths set in advance, the converted optical signals converted by the optical wavelength converters 12 to 14 are input, and the converted optical signals are output to PD24 to PD26 described later. Specifically, in the above example, the optical wavelength conversion unit 12 in which the wavelength λ1 is set is connected to the port A21 and the PD 24, and the optical wavelength conversion in which the wavelength λ3 is set to the port B22. The unit 13 and the PD 25 are connected, and the port C23 is connected to the optical wavelength conversion unit 14 in which the wavelength λ2 is set and the PD 26. The port A21 receives the converted optical signal converted into the wavelength λ1 by the optical wavelength converter 12, and outputs the converted optical signal to the PD 24. Similarly, the port B22 receives the converted optical signal converted into the wavelength λ3 by the optical wavelength converter 13, and outputs the converted optical signal to the PD 25. The port C23 receives the wavelength λ2 by the optical wavelength converter 14. The converted optical signal converted into is input, and the converted optical signal is output to the PD 26.

  In addition, although the case where it has three ports from port A21 to port C23 is demonstrated here, this invention is not limited to this, You may have four ports, There is no limit to the number of ports. Moreover, the optical wavelength converter connected to each port may be connected by the number of ports, and one optical wavelength converter may be connected to a plurality of ports. When one optical wavelength converter is connected to multiple ports, each port has a different wavelength, so the optical wavelength converter has multiple optical wavelengths. An optical signal converted into a different wavelength is input.

PD24 to PD26 are circuits such as an LSI (Large Scale Integration) that is connected to each of a plurality of ports and detects an optical power level of a converted optical signal input to each port. Specifically, in the above example, the PD 24 is connected to the port A21, and the converted optical signal converted into the wavelength λ1 by the optical wavelength conversion unit 12 is input from the port A21, and the input converted signal is input. The optical power level of the optical signal is detected and notified to an optical level monitoring controller 60 described later. Similarly, the PD 25 is connected to the port B22, and the converted optical signal converted into the wavelength λ3 by the optical wavelength converter 13 is input from the port B22, and the optical power level of the input converted optical signal is set. Detected and notified to an optical level monitoring controller 60 described later, the PD 26 is connected to the port C23, and the converted optical signal converted into the wavelength λ2 by the optical wavelength converter 14 is input from the port C23, The optical power level of the input converted optical signal is detected and notified to an optical level monitoring control unit 60 described later. These PD24 to PD26 correspond to “first optical power level detection means” described in the claims.

The optical switches 27 to 29 input the converted optical signals input to the respective ports to an optical coupler 30 described later. More specifically, in the above example, when the optical level monitoring controller 60, which will be described later, is controlled to input the converted optical signal to the optical coupler 30, the optical switch 27 changes the wavelength λ1 input from the PD 24 to the wavelength λ1. The converted optical signal after conversion is input to the optical coupler 30. Similarly, the optical switch 28 inputs the converted optical signal converted to the wavelength λ3 input from the PD 25 to the optical coupler 30, and the optical switch 29 converts the converted light converted to the wavelength λ2 input from the PD 26. A signal is input to the optical coupler 30. Here, since the wavelength λ2 is set in the port B22 , if it is normal, the converted optical signal converted into the wavelength λ2 is input to the optical switch 28 via the PD 25. In this example, Since the optical wavelength converter 13 for converting to the wavelength λ3 is connected, the converted optical signal converted to the wavelength λ3 is input to the optical switch 28. However, since the optical switches 27 to 29 are functions for transmitting optical signals to the last, even if a converted optical signal converted to an incorrect wavelength is input, the converted optical signal is input to the optical coupler 30. input. In this example, the case where there are three optical switches will be described. However, the present invention is not limited to this, and the optical wavelength division multiplexing system has as many optical switches as the number of ports. The optical switches 27 to 29 correspond to “input means” recited in the claims.

  The optical coupler 30 multiplexes all the converted optical signals input from a plurality of ports to generate a multiplexed optical signal. Specifically, in the above example, when the converted optical signals converted into the wavelengths λ1 to λ3 input from the ports A21 to C23 are input via the optical switches 27 to 29, the optical coupler 30 All the converted optical signals that have been input are multiplexed and output to the transmission optical amplification unit 40 described later. Here, even when a converted optical signal converted to a wavelength different from the wavelength set for each port is input, the optical coupler 30 multiplexes all the input converted optical signals and transmits them. Output to the optical amplification unit 40. The optical coupler 30 corresponds to “optical signal multiplexing means” recited in the claims.

  The transmission light amplifying unit 40 has a PD 41, an optical branching unit 42, and an optical amplifying unit 43, particularly as closely related to the present invention, and amplifies the multiplexed optical signal input to the PD 41. The data is transmitted to the receiving side optical wavelength multiplexing device 70. The PD 41 is a circuit such as an LSI that outputs a multiplexed optical signal output from the optical wavelength multiplexing unit 20 to an optical branching unit 42 described later. Specifically, the PD 41 receives the multiplexed optical signal output from the optical coupler 30 of the optical wavelength multiplexing unit 20 and outputs the multiplexed optical signal to the optical branching unit 42.

  The optical branching unit 42 branches the multiplexed optical signal multiplexed by the optical coupler 30 of the optical wavelength multiplexing unit 20. Specifically, in the above example, when the optical branching unit 42 receives the multiplexed optical signal multiplexed by the optical coupler 30 of the optical wavelength multiplexing unit 20 via the PD 41, the multiplexed optical signal will be described later. It branches to the optical spectrum monitoring part 50 and the optical amplification part 43, and the said multiplexed optical signal is output to each. The light branching unit 42 corresponds to the “light branching unit” recited in the claims.

  The optical amplifying unit 43 amplifies the multiplexed optical signal to a transmittable optical level and transmits the amplified optical signal to the reception side optical wavelength multiplexing device 70. More specifically, in the above example, the input multiplexed optical signal branched by the optical branching unit 42 cannot be transmitted because the optical level has deteriorated by almost half. Therefore, the optical amplifying unit 43 amplifies the input multiplexed optical signal branched by the optical branching unit 42 to a transmittable optical level (for example, about twice the input level), and receives the receiving side light. It transmits to the wavelength multiplexing apparatus 70.

  The optical spectrum monitoring unit 50 detects the optical power level after multiplexing at a predetermined wavelength set for each port from the multiplexed optical signal branched by the optical branching unit 42. Specifically, in the above example, the optical spectrum monitoring unit 50 detects the optical power level after multiplexing of the wavelength λ1 set in the port A21 from the multiplexed optical signal branched by the optical branching unit 42. Then, it transmits to the light level monitoring control part 60 mentioned later. Similarly, the optical spectrum monitoring unit 50 detects the optical power level after multiplexing of the wavelength λ2 set in the port B22, transmits it to the optical level monitoring control unit 60 described later, and is set in the port C23. The multiplexed optical power level of wavelength λ3 is detected and transmitted to the optical level monitoring controller 60 described later. The optical spectrum monitoring unit 50 corresponds to “second optical power level detection unit” recited in the claims.

  The optical level monitoring controller 60 controls the optical switches 27 to 29 so that the optical switches 27 to 29 do not input the converted optical signal to the optical coupler 30 until the converted optical power levels are detected by the PDs 24 to 26. When the converted optical power levels are detected by the PDs 24 to 26, the optical switches 27 to 29 control the optical switches 27 to 29 so as to input the converted optical signals to the optical coupler 30, and the PDs 24 to PD26. When the converted optical power level detected by the optical spectrum monitoring unit 50 is compared with the separated optical power level detected by the optical spectrum monitoring unit 50, a difference is found in the comparison result. It is detected that an optical wavelength conversion unit for converting to a wavelength different from the predetermined wavelength is erroneously connected.

  Specifically, in the above example, the optical level monitoring controller 60 inputs the converted optical signal to the optical coupler 30 by the optical switches 27 to 29 until the converted optical power level is detected by the PDs 24 to 26. So that the optical switches 27 to 29 are stopped and the converted optical power levels are detected by the PDs 24 to 26 so that the optical switches 27 to 29 input the converted optical signals to the optical coupler 30. The optical switches 27 to 29 are activated and controlled.

  Further, the optical level monitoring control unit 60 converts the optical power level after conversion of the wavelength λ1 detected by the PD 24 and the optical power after separation of the wavelength λ1 set in the port A21 detected by the optical spectrum monitoring unit 50. Since both are optical wavelengths converted to the wavelength λ1, there is no difference between the two optical power levels, and the optical signal is transmitted to the port A21 in which the wavelength λ1 is set. It is determined that the optical wavelength conversion unit for converting to is normally connected. The optical level monitoring control unit 60 also converts the optical power level after the conversion of the wavelength λ3 detected by the PD 25 and the optical power after the separation of the wavelength λ2 set in the port B22 detected by the optical spectrum monitoring unit 50. Since the difference is detected from the optical power levels of the two wavelengths by detecting the optical power levels of the different wavelengths, the wavelength is converted to a wavelength different from the wavelength λ2 set in the port B22. It detects that the optical wavelength converter is misconnected. Similarly, the optical level monitoring controller 60 converts the optical power level after conversion of the wavelength λ2 detected by the PD 26 and the light after separation of the wavelength λ3 set in the port C23 detected by the optical spectrum monitoring unit 50. Compared with the power level, since the optical power level of the different wavelength is detected, the difference is detected from the optical power level of the two, so that the wavelength is converted to a wavelength different from the wavelength λ3 set in the port C23. It is detected that the optical wavelength converter to be connected is erroneously connected. The light level monitoring control unit 60 corresponds to “input control means” and “erroneous connection detection means” recited in the claims.

(Configuration of receiving side optical wavelength multiplexing device 70)
The reception-side optical wavelength multiplexing device 70 includes a storage unit 71, a reception light amplification unit 72, an optical wavelength separation unit 74, optical wavelength conversion units 82 to 84, and an optical level monitoring unit 85. The storage unit 71 sets the wavelengths set in the ports A21 to C23 of the transmission side optical wavelength multiplexing device 10 to ports A79 to C81, which will be described later, in the same manner as the storage unit 11 of the transmission side optical wavelength multiplexing device 10. As a wavelength to be stored. For example, the storage unit 71 stores “port A, λ1”, “port B, λ2”, “port C, λ3”, and the like (see FIG. 3).

  The reception light amplifying unit 72 has an optical amplifying unit 73 particularly closely related to the present invention, and amplifies the received multiplexed optical signal. The optical amplifying unit 73 amplifies the deteriorated multiplexed optical signal. Specifically, since the optical power level is degraded while the multiplexed optical signal transmitted from the transmission side optical wavelength multiplexer 10 is transmitted, the optical amplifying unit 73 amplifies the optical power level. , Recover the multiplexed optical signal.

  The optical wavelength demultiplexing unit 74 performs control for demultiplexing the received multiplexed optical signal. In particular, as closely related to the present invention, the received optical wavelength demultiplexing unit 75, the PDs 76 to 78, and the port A79. To port C81. The received light wavelength separation unit 75 separates the multiplexed optical signal into the original wavelength. Specifically, in the above-described example, when the multiplexed optical signal transmitted from the transmission side optical wavelength multiplexing device 10 is amplified by the reception optical amplification unit 72 and input, the reception optical wavelength demultiplexing unit 75 The multiplexed optical signals are separated to obtain optical signals having wavelengths λ1 to λ3 (wavelengths stored in the storage unit 11) set in the ports A21 to C23 of the transmission side optical wavelength multiplexer 10.

  PDs 76 to 78 are circuits such as an LSI (Large Scale Integration) that is connected to each of a plurality of ports and detects the optical power level of the separated optical signal. Specifically, in the above example, the PDs 76 to 78 are set to the ports A 21 to C 23 of the transmission side optical wavelength multiplexer 10 by separating the multiplexed optical signal by the reception optical wavelength demultiplexing unit 75. When separated optical signals having wavelengths λ1 to λ3 (wavelengths stored in the storage unit 11) are obtained, the optical power level of each separated optical signal is detected and output to an optical level monitoring unit 85 described later. To do.

  The ports A79 to C81 have predetermined wavelengths set in advance, and the separated optical signals separated by the received light wavelength separation unit 75 are input, and the separated optical signals are input to the optical wavelength conversion units 82 to 84 described later. Output. Specifically, in the above example, the port A79 is set to λ1, which is the same wavelength as the port A21 of the transmission side optical wavelength multiplexing device 10, and the wavelength λ1 separated by the received light wavelength separation unit 75 is set. The separated optical signal is input via the PD 76, and the separated optical signal having the wavelength λ1 is output to the connected optical wavelength converter 82. Further, λ2, which is the same wavelength as that of the port B22 of the transmission side optical wavelength multiplexing device 10, is set in the port B80, and the optical signal after separation of the wavelength λ2 separated by the reception light wavelength separation unit 75 is transmitted to the PD 77. Then, the separated optical signal having the wavelength λ2 is output to the connected optical wavelength converter 83. Here, the optical signal having the wavelength of λ2 is generated by the optical wavelength converter 14 connected to the port C23 on the transmission side, but is received by the PD 77 connected to the port B80 on the reception side. As described above, since the wrong optical wavelength converter 13 is connected to the port B22 on the transmission side, wrong reception is performed on the reception side.

  The optical wavelength converters 82 to 84 convert the separated separated optical signal into an optical signal having the original wavelength. More specifically, in the above example, the optical wavelength conversion unit 82 converts the separated optical signal input to the port A79 converted to the wavelength λ1 to the original wavelength transmitted by the terminal device 1. It converts and transmits to the terminal device 1 which is a transmission destination. In addition, since the wrong optical wavelength converter 13 (converts to wavelength λ3) is connected to the port B22 in which the wavelength λ2 is set, the terminal device 2 transmits data to the terminal device 2. On the receiving side, the wavelength λ2 transmitted from the terminal device 3 is input to the port B80, and the optical wavelength conversion unit 83 converts the separated optical signal having the wavelength λ2 and transmits it to the terminal device 2. Become. Similarly, the optical signal of λ3 transmitted from the terminal device 2 is transmitted to the terminal device 3.

  The optical level monitoring unit 85 temporarily stores and monitors the optical power level detected by the PDs 76 to 78. Specifically, in the above example, the optical level monitoring unit 85 detects the optical power level of the separated optical signal to which the separated optical signal separated by the received light wavelength separation unit 75 is input, by the PDs 76 to 78. The optical power level of the post-separation optical signal is temporarily stored and monitored.

[Processing by optical wavelength multiplexing system]
Next, processing by the optical wavelength multiplexing system will be described with reference to FIG. FIG. 4 is a flowchart illustrating a flow of erroneous connection detection processing in the optical wavelength multiplexing system according to the first embodiment.

  As shown in FIG. 4, when the optical power levels of the converted optical signals input to the respective ports are detected by the PDs 24 to 26 of the transmission side optical wavelength multiplexing device 10 (step S401), the transmission side optical wavelength multiplexing device 10 is detected. The optical level monitoring control unit 60 controls the optical switches 27 to 29 so as to input the converted optical signal to the optical coupler 30 with respect to the optical switches 27 to 29 connected to the port where the optical power level is detected. (Step S402).

  Then, the optical coupler 30 of the transmission side optical wavelength multiplexing device 10 multiplexes all the converted optical signals that have been input (step S403), and the optical branching unit 42 converts the multiplexed optical signal into an optical spectrum monitoring unit. 50 and the optical amplifier 43 are branched (step S404).

  Then, the optical spectrum monitoring unit 50 of the transmission-side optical wavelength multiplexing device 10 detects the optical power level after branching of a predetermined wavelength set for each port from the branched optical signal after branching (step S405). .

  Subsequently, the optical level monitoring control unit 60 of the transmission side optical wavelength multiplexing device 10 includes the optical power level after conversion detected by the PDs 24 to 26 and the optical power level after branching detected by the optical spectrum monitoring unit 50. Are compared (step S406) to determine whether there is a difference (step S407).

  When it is determined that there is a difference (Yes at Step S407), the optical level monitoring control unit 60 of the transmission side optical wavelength multiplexing device 10 converts the wavelength to a wavelength different from the predetermined wavelength set in each port. Is detected as being erroneously connected (step S408), and if it is determined that there is no difference, it is determined that no erroneous connection has occurred, and the process is terminated.

[Effects of Example 1]
As described above, according to the first embodiment, all the converted optical signals input from the plurality of ports are detected by detecting the optical power levels of the converted optical signals that are connected to the plurality of ports and input to the respective ports. Are multiplexed to generate a multiplexed optical signal.The converted optical signal is input to each port, and the converted optical signal is input until the converted optical power level is detected. When the optical power level after conversion is detected and the converted optical power level is detected, the optical signal after conversion is controlled to be input, and the multiplexed optical signal is multiplexed with a predetermined wavelength set for each port. The optical power level after detection is detected, and the detected optical power level after conversion is compared with the detected optical power level after multiplexing. Waves that are different from the specified wavelength And detects the light wavelength converter is erroneously connected to convert to, together it is possible to detect an erroneous connection, it is possible to reduce the cost of system construction.

  For example, it is possible to detect a port misconnection using an optical switch as an input means and an optical coupler (CPL) as an optical signal multiplexing means. As a result, an erroneous connection using an expensive arrayed waveguide grating (AWG) is possible. It is possible to reduce the cost for system construction as compared with the case of detecting. Furthermore, without stopping the system, it is possible to reconnect the misconnected optical fiber cable to the correct connection destination or change the port settings according to the wavelength transmitted to the optical fiber cable. .

  Further, according to the first embodiment, the multiplexed optical signal is branched, and the optical power level after multiplexing at a predetermined wavelength set for each port is detected from the branched multiplexed optical signal. When the detected optical power level after conversion is compared with the detected optical power level after branching and there is a difference in the comparison result, it differs from the predetermined wavelength set for each port Since it detects that the optical wavelength conversion unit that converts to wavelength is misconnected, it can detect misconnection within the optical wavelength multiplexing system on the transmission side, thereby further reducing the cost of system construction. Is possible.

  For example, when an optical switch is used as the input means and an optical coupler (CPL) is used as the optical signal multiplexing means, an optical signal having a wrong wavelength is also multiplexed due to erroneous connection, so that a multiplexed optical signal is transmitted. Previously, it is possible to further reduce the cost of system construction by detecting erroneous connections in the optical wavelength multiplexing system on the transmission side, and the quality of the multiplexed optical signal and the optical wavelength multiplexing system. It is possible to prevent deterioration.

  In the first embodiment, the case where an erroneous connection is detected by comparing the converted optical power level detected by the PD with the branched optical signal branched after multiplexing has been described. However, the optical power level after conversion detected by the PD may be compared with the optical power level after separation after further separating the optical signal after branching after multiplexing.

  Therefore, in Example 2, the converted optical power level detected by the PD is compared with the separated optical power level obtained by further separating the branched optical signal branched after multiplexing, using FIG. A case where an erroneous connection is determined will be described.

[Overall configuration of optical wavelength division multiplexing system]
The overall configuration of the optical wavelength multiplexing system according to the second embodiment will be described with reference to FIG. FIG. 5 is a diagram for explaining the overall configuration of the optical wavelength multiplexing system according to the second embodiment.

  As shown in FIG. 5, similarly to FIG. 1 of the first embodiment, the optical wavelength multiplexing system according to the second embodiment includes a transmission side optical wavelength multiplexing device, a reception side optical wavelength multiplexing device, and a terminal device using optical fiber cables. It is configured to be communicable with each other. The transmission side optical wavelength multiplexing device includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal, and a predetermined wavelength is set in advance. Are connected to a plurality of ports (port A to port C).

  Specifically, as in the first embodiment, the wavelengths λ1 to λ3 are set to the ports A to C, respectively. The port A in which the wavelength λ1 is set is connected to an optical wavelength conversion unit that converts the input optical signal into an optical wavelength of the wavelength λ1. In addition, an optical wavelength conversion unit that converts an input optical signal into a wavelength λ3 is connected to the port B in which the wavelength λ2 is set. The port C in which the wavelength λ3 is set is connected to an optical wavelength converter that converts the input optical signal to the wavelength λ2. In other words, the port B and the port C are set with an optical wavelength conversion unit that converts the wavelength to a wavelength different from the set wavelength.

  Under such a configuration, the transmission-side optical wavelength multiplexing device controls the optical switch so that the optical switch does not input the converted optical signal to the optical coupler until the converted optical power level is detected. Then, the optical wavelength conversion unit of the transmission-side optical wavelength multiplexing device that has received the optical signal transmitted by the terminal device 1 converts the optical signal into an optical signal having the wavelength λ1, and sends the converted optical signal to the port A. (See (1) and (2) in FIG. 5).

  Then, the transmission-side optical wavelength multiplexing device is connected to each of the plurality of ports, and detects the optical power level of the converted optical signal input to each port (see (3) in FIG. 5). Specifically, the transmission side optical wavelength multiplexing device detects the optical power level of the converted optical signal of wavelength λ1 input to port A.

  Subsequently, when the optical power level after conversion is detected, the transmission-side optical wavelength multiplexing device controls the optical switch so that the optical switch inputs the converted optical signal to the optical coupler ((4) in FIG. 5). reference). More specifically, in the above example, when the optical power level after conversion input to port A is detected, the optical switch 1 inputs the optical signal after conversion to the optical coupler. Thus, the optical switch 1 is controlled.

  Then, the transmission side optical wavelength multiplexing device inputs the converted optical signal input to each port to the optical coupler, and multiplexes all the converted optical signals input from a plurality of ports to generate a multiplexed optical signal. (See (5) and (6) in FIG. 5). Specifically, in the above example, the transmission-side optical wavelength multiplexing device inputs the converted optical signal of wavelength λ1 input to port A to the optical coupler, and multiplexes all the converted optical signals input thereto. Then, a multiplexed optical signal is generated and output to the transmission optical amplification unit.

  Thereafter, the transmission side optical wavelength multiplexing device branches the multiplexed optical signal multiplexed by the optical coupler, and splits the multiplexed optical signal for each predetermined wavelength set in the plurality of ports by the optical wavelength demultiplexing unit. Each is separated, and the optical power level after separation is detected (see (7) to (9) in FIG. 5). Specifically, in the above example, the transmission-side optical wavelength multiplexing device branches the multiplexed optical signal multiplexed by the optical coupler, and sets the branched multiplexed optical signal to port A by the optical wavelength demultiplexing unit Then, the optical power level of the separated wavelength λ1 is detected.

  Then, the transmission side optical wavelength multiplexing device compares the detected optical power level after conversion with the detected optical power level after separation, and when there is a difference in the comparison result, It detects that the optical wavelength conversion part which converts into a wavelength different from the predetermined wavelength to be set is erroneously connected (see (10) in FIG. 5). Specifically, in the above example, the transmission-side optical wavelength multiplexing device transmits the converted optical power level converted to the wavelength λ1 input to the port A and the multiplexed optical signal multiplexed by the optical coupler. The optical power level after splitting and splitting from the split multiplexed optical signal into the wavelength λ1 set in the port A is compared. Subsequently, the transmission-side optical wavelength multiplexing device has two optical signals whose optical power levels of the detected converted optical power level and the separated optical power level are converted to the wavelength λ1. It is determined that there is no difference in the optical power level, and the optical wavelength conversion unit that converts the optical signal into the wavelength λ1 is normally connected to the port A in which the wavelength λ1 is set.

  Similarly to the above-described method, when an optical signal is transmitted from the terminal device 2, the transmission side optical wavelength multiplexing device determines whether or not the optical wavelength conversion unit to which the terminal device 2 is connected is erroneously connected. .

  More specifically, the optical wavelength conversion unit of the transmission-side optical wavelength multiplexing device that has received the optical signal transmitted by the terminal device 2 converts the optical signal into an optical signal having the wavelength λ3 and converts the optical signal to the port B. The rear optical signal is output, and the optical power level of the converted optical signal having the wavelength λ3 input to the port B is detected (see (11) to (13) in FIG. 5).

  Thereafter, when the converted optical power level is detected, the transmission-side optical wavelength multiplexing apparatus controls the optical switch 2 so that the optical switch 2 inputs the converted optical signal to the optical coupler, and the ports A and B The converted optical signal input to the optical coupler is input to the optical coupler, all the converted optical signals input from port A and port B are multiplexed to generate a multiplexed optical signal, and the multiplexed multiplexed light The signal is branched, and the branched multiplexed optical signal is separated into optical signals of wavelengths λ1 and λ2 set in port A and port B, and the optical power level after the separation is detected ((( 14) to (19)).

  Then, the transmitting side optical wavelength multiplexing device compares the detected optical power level after conversion with the detected optical power level after separation, and if there is a difference between the comparison results, It is detected that the optical wavelength conversion unit for converting to a wavelength different from the set wavelength λ2 is erroneously connected (see (20) in FIG. 5).

  Specifically, the transmission side optical wavelength multiplexing device branches the branched optical power level converted into the wavelength λ3 input to the port B and the multiplexed optical signal multiplexed by the optical coupler and branched. When the optical power level after separation obtained by separating the optical signal having the wavelength λ2 set at the port B from the multiplexed optical signal is compared, the optical power levels of different wavelengths are detected. Therefore, it is determined that a difference is detected between the optical power levels of the two. Then, the transmission side optical wavelength multiplexing device detects that the optical wavelength conversion unit that converts the wavelength to a wavelength different from the wavelength λ2 set in the port B is erroneously connected.

  As described above, the optical wavelength multiplexing system according to the second embodiment branches the multiplexed optical signal, and separates the multiplexed optical signal for each predetermined wavelength set in a plurality of ports. Then, the optical power level after separation of a predetermined wavelength set for each port is detected from the separated optical signal, and the detected optical power level after conversion is compared with the optical power level after separation. However, when there is a difference in the comparison result, it is detected that the optical wavelength conversion unit that converts the wavelength to a wavelength different from the predetermined wavelength set in each port is erroneously connected. And cost can be further reduced.

  For example, instead of using a very expensive optical spectrum monitoring device as the optical branching means, using an arrayed waveguide grating (AWG) that is cheaper than the optical spectrum monitoring device as the optical wavelength separation means, the cost for system construction can be further increased. It is possible to reduce.

  By the way, in the first embodiment, the case where the erroneous connection is detected by comparing the converted optical power level detected by the PD with the optical power level of the branched optical signal branched after multiplexing has been described. The present invention is not limited to this, and the converted optical power level detected by the PD may be compared with the optical power level after reception of the received multiplexed optical signal.

  Therefore, in the third embodiment, by using FIG. 5, the converted optical power level detected by the PD is compared with the optical power level after reception of the received multiplexed optical signal to determine the erroneous connection. The case will be described.

[Overall configuration of optical wavelength division multiplexing system]
The overall configuration of the optical wavelength multiplexing system according to the third embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining the overall configuration of the optical wavelength multiplexing system according to the third embodiment.

  As shown in FIG. 6, as in FIG. 1 of the first embodiment, the optical wavelength multiplexing system according to the third embodiment includes a transmission side optical wavelength multiplexing device, a reception side optical wavelength multiplexing device, and a terminal device using optical fiber cables. It is configured to be communicable with each other. The transmission side optical wavelength multiplexing device includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal, and a predetermined wavelength is set in advance. Are connected to a plurality of ports (port A to port C).

  Specifically, as in the first embodiment, the wavelengths λ1 to λ3 are set for the ports A to C, respectively. The port A in which the wavelength λ1 is set is connected to an optical wavelength conversion unit that converts the input optical signal into an optical wavelength of the wavelength λ1. In addition, an optical wavelength conversion unit that converts an input optical signal into a wavelength λ3 is connected to the port B in which the wavelength λ2 is set. The port C in which the wavelength λ3 is set is connected to an optical wavelength converter that converts the input optical signal to the wavelength λ2. In other words, the port B and the port C are set with an optical wavelength conversion unit that converts the wavelength to a wavelength different from the set wavelength.

  The same settings as those of the ports A to C of the transmission side optical wavelength multiplexing apparatus are made in the ports X to Z of the reception side optical wavelength multiplexing apparatus, and the optical signal is transmitted to each port based on the original wavelength. An optical wavelength conversion unit for converting to is connected. Specifically, the wavelength λ1 is set for the port X, the wavelength λ2 is set for the port Y, and the wavelength λ3 is set for the port Z. The port X to port Z are connected to optical wavelength conversion units that convert received optical signals to wavelengths used by the terminal devices 1 to 3 that transmit data (optical signals).

  In such a configuration, the transmission side optical wavelength multiplexing device controls the optical switch so that the optical switch does not input the converted optical signal to the optical multiplexing unit until the converted optical power level is detected. Then, the optical wavelength conversion unit of the transmission-side optical wavelength multiplexing device that has received the optical signal transmitted by the terminal device 1 converts the optical signal into an optical signal having the wavelength λ1, and sends the converted optical signal to the port A. (See (1) and (2) in FIG. 6).

  Then, the transmission side optical wavelength multiplexing apparatus is connected to each of the plurality of ports, and detects the optical power level of the converted optical signal input to each port (see (3) in FIG. 6). Specifically, the transmission side optical wavelength multiplexing device detects the optical power level of the converted optical signal of wavelength λ1 input to port A.

  Subsequently, when the optical power level after conversion is detected, the transmission-side optical wavelength multiplexing device controls the optical switch so that the optical switch inputs the converted optical signal to the optical coupler ((4) in FIG. 6). reference). More specifically, in the above example, when the optical power level after conversion input to port A is detected, the optical switch 1 inputs the optical signal after conversion to the optical coupler. Thus, the optical switch 1 is controlled.

  Then, the transmission side optical wavelength multiplexing device inputs the converted optical signal input to each port to the optical coupler, and multiplexes all the converted optical signals input from a plurality of ports to generate a multiplexed optical signal. (Refer to (5) and (6) in FIG. 6). More specifically, in the above example, the transmission-side optical wavelength multiplexing device inputs the converted optical signal converted to the wavelength λ1 input to the port A to the optical coupler, and all the converted optical signals that are input Are multiplexed to generate a multiplexed optical signal and output to the transmission optical amplification unit.

  Subsequently, the transmission-side optical wavelength multiplexing device amplifies the multiplexed optical signal that has been multiplexed and branched to an optical power level necessary for transmission, and transmits the amplified optical signal to the reception-side optical wavelength multiplexing device ((( 7)).

  The receiving side optical wavelength multiplexing device that receives the multiplexed optical signal amplifies the optical power level deteriorated in transmission, and the received optical wavelength demultiplexing unit separates the multiplexed optical signal for each predetermined wavelength ((( 8)), the power level of the separated optical signal of wavelength λ1 is detected as an optical power level after reception, and is transmitted to the optical level monitoring control unit of the transmission side optical wavelength division multiplexer (see (9) in FIG. 6). ). Specifically, in the above example, the reception-side optical wavelength multiplexing device amplifies the received multiplexed optical signal and separates it into an optical signal having the wavelength λ1 set in the port X by the received optical wavelength separation unit. . Then, the reception side optical wavelength multiplexing device detects the received optical power level of the wavelength λ1 obtained by the separation and transmits it to the optical level monitoring control unit of the transmission side optical wavelength multiplexing device.

  Subsequently, the optical level monitoring control unit of the transmission side optical wavelength multiplexing apparatus compares the detected optical power level after conversion with the detected optical power level after reception, and there is a difference in the comparison result. If the optical wavelength conversion unit converts the wavelength to a wavelength different from the predetermined wavelength set in each port, it is detected that the optical wavelength conversion unit is erroneously connected (see (10) in FIG. 6). Specifically, in the above example, the transmission-side optical wavelength multiplexing device is obtained by separating the converted optical power level converted into the wavelength λ1 input to the port A and the received multiplexed optical signal. The optical power level after reception of the wavelength λ1 is compared. Subsequently, the transmission-side optical wavelength multiplexing device uses the two optical signals because the optical signals of both the detected optical power level after conversion and the optical power level after reception are converted into the wavelength λ1. It is determined that there is no difference in power level and that the optical wavelength converter that converts the optical signal into the wavelength λ1 is normally connected to the port A in which the wavelength λ1 is set.

  Similar to the above-described method, when an optical signal is transmitted from the terminal device 2, the transmission-side optical wavelength multiplexing device determines whether or not the optical wavelength conversion unit 2 to which the terminal device 2 is connected is erroneously connected. To do.

  More specifically, the optical wavelength conversion unit of the transmission-side optical wavelength multiplexing device that has received the optical signal transmitted by the terminal device 2 converts the optical signal into an optical signal having the wavelength λ3 and converts the optical signal to the port B. The rear optical signal is output, and the optical power level of the converted optical signal having the wavelength λ3 input to the port B is detected (see (11) to (13) in FIG. 6).

  Thereafter, when the converted optical power level is detected, the transmission-side optical wavelength multiplexing apparatus controls the optical switch 2 so that the optical switch 2 inputs the converted optical signal to the optical coupler, and the ports A and B The converted optical signal input to the optical coupler is input to the optical coupler, all the converted optical signals input from port A and port B are multiplexed to generate a multiplexed optical signal, and the multiplexed optical signal is received on the receiving side. The data is transmitted to the optical wavelength multiplexing device (see (14) to (17) in FIG. 6).

  Subsequently, the receiving-side optical wavelength multiplexing device that has received the multiplexed optical signal separates the received multiplexed optical signal into optical signals of wavelengths λ1 and λ2 set in port X and port Y, and The optical power level is detected and transmitted to the optical level monitoring control unit of the transmission side optical wavelength multiplexing device (see (18) and (19) in FIG. 6).

  The optical level monitoring control unit of the transmission side optical wavelength multiplexing device compares the detected optical power level after conversion with the received optical power level after reception, and there is a difference in the comparison result In addition, it is detected that an optical wavelength converter that converts the wavelength to a wavelength different from the wavelength λ2 set in the port B is erroneously connected (see (20) in FIG. 6).

  Specifically, the optical level monitoring and control unit of the transmission-side optical wavelength division multiplexer performs the converted optical power level converted to the wavelength λ3 input to the port B and the received optical power of the separated wavelength λ2. Therefore, it is determined that a difference has been detected between the optical power levels of the two wavelengths. Then, the transmission side optical wavelength multiplexing device detects that the optical wavelength conversion unit that converts the wavelength to a wavelength different from the wavelength λ2 set in the port B is erroneously connected.

  As described above, according to the third embodiment, the detected optical power level after conversion and the multiplexed optical signal receiving side device after the received multiplexed optical signal is separated for each predetermined wavelength. Light that receives the received optical power level, compares it with the received optical power level, and when there is a difference in the comparison result, light that is converted to a wavelength different from the predetermined wavelength set for each port Since it is detected that the wavelength conversion unit is erroneously connected, it is possible to detect the erroneous connection and to further reduce the cost.

  For example, the received multiplexed optical signal generally used in the optical wavelength multiplexing system is separated, the separated optical power level detected for each separated wavelength is received by feedback, and the erroneous connection is detected. As a result of not having to add a new function to a normal optical wavelength multiplexing system, the cost can be further reduced.

  In the first embodiment, the case where an optical switch is used as means for inputting the converted optical signal to the optical coupler has been described. However, the present invention is not limited to this, and is not an optical switch but a VOA (Variable). Optical Attenuator) may be used.

  Thus, in the fourth embodiment, a case where a VOA is used instead of an optical switch as means for inputting a converted optical signal to an optical coupler will be described with reference to FIG. FIG. 7 is a diagram for explaining the overall configuration of the optical wavelength multiplexing system according to the fourth embodiment.

  As shown in FIG. 7, as in FIG. 1 of the first embodiment, the optical wavelength multiplexing system according to the fourth embodiment is configured such that the transmission side optical wavelength multiplexing device, the reception side optical wavelength multiplexing device, and the terminal device are mutually connected by an optical fiber cable. Connected to be communicable with each other. As in the first embodiment, the transmission-side optical wavelength multiplexing device includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal. Are connected to a plurality of ports (port A to port C) having predetermined wavelengths.

  Specifically, as in the first embodiment, the wavelengths λ1 to λ3 are set for the ports A to C, respectively. The port A in which the wavelength λ1 is set is connected to an optical wavelength conversion unit that converts the input optical signal into an optical wavelength of the wavelength λ1. In addition, an optical wavelength conversion unit that converts an input optical signal into a wavelength λ3 is connected to the port B in which the wavelength λ2 is set. The port C in which the wavelength λ3 is set is connected to an optical wavelength converter that converts the input optical signal to the wavelength λ2. In other words, the port B and the port C are set with an optical wavelength conversion unit that converts the wavelength to a wavelength different from the set wavelength.

  The difference from the first embodiment is that the transmission side optical wavelength multiplexing apparatus sets the attenuation amount of the VOA to the maximum until the optical power level after conversion is detected, and the optical power level after conversion is detected. In other words, the attenuation amount is reduced for each port so that the optical power level input to the optical coupler is constant.

  More specifically, as in the first embodiment, when an optical signal is input from the terminal device 1, the optical wavelength conversion unit of the transmission side optical wavelength multiplexing device converts the optical signal into the wavelength λ1 and sends it to the port A. Then, the transmission side optical wavelength multiplexing device detects the optical power level of the received and converted optical signal from the port A (see (1) to (3) in FIG. 7).

  Then, when the converted optical power level is detected, the transmitting side optical wavelength multiplexing apparatus controls the VOA 1 so that the VOA 1 inputs the converted optical signal to the optical coupler, and the converted light input to each port. The signal is input to the optical coupler, all converted optical signals input from a plurality of ports are multiplexed by the optical coupler to generate a multiplexed optical signal, and the multiplexed optical signal is branched by the optical branching unit, Detects the optical power level after multiplexing the predetermined wavelength set for each port from the multiplexed optical signal that has been branched, and detects the optical power level after conversion and the detected optical power level after branching. And when the difference is found in the comparison result, it is detected that the optical wavelength conversion unit that converts the wavelength to a wavelength different from the predetermined wavelength set in the port 1 is misconnected (FIG. 7). (Refer to (4) to (9)).

  Then, the transmission side optical wavelength multiplexing device decreases the attenuation amount of VOA 1 so that the optical power level input to the optical coupler becomes constant (see (10) in FIG. 7). Thereafter, the optical signal transmitted from the terminal device 1 is input to the optical coupler with the attenuation gradually reduced and multiplexed.

  Similarly, the optical signal input from the terminal device 2 is converted to the wavelength λ3 and the optical power level is detected, and then the optical power level after multiplexing and branching is detected, and the port 2 It detects that the optical wavelength conversion part which converts into a wavelength different from the predetermined wavelength set in (2) is erroneously connected (see (11) to (19) in FIG. 7). In this case, the transmission side optical wavelength multiplexing device does not decrease the attenuation amount of the VOA 2 because the erroneous connection is detected. Thereafter, when the erroneous connection is not detected by the above-described method (when the connection is correctly performed), the transmission-side optical wavelength multiplexing device decreases the attenuation amount of the VOA 2.

  As described above, according to the fourth embodiment, the attenuation is set to the maximum until the converted optical power level is detected, and when the converted optical power level is detected, for each port, Since the attenuation amount is reduced so that the input optical power level is constant, the attenuation amount for the force light signal is arbitrarily set, and the optical power level of the input optical signal is attenuated and input according to the set attenuation amount. In this case, it is possible to prevent quality degradation of the multiplexed optical signal and the optical wavelength multiplexing system. For example, it is possible to transmit a multiplexed optical signal with higher quality when multiplexing is performed with a constant optical power level compared to multiplexing wavelengths with different optical power levels.

  By the way, although Example 1-4 demonstrated only the case where a misconnection was detected, this invention is not limited to this, A misconnection is detected and a user (maintenance person) detects a correct connection destination. May be notified.

  Therefore, in the fifth embodiment, by using FIG. 8, an incorrect connection is detected, a correct connection destination is notified to the user (maintenance person), and an optical switch connected to the port where the incorrect connection is detected is changed to “ A case where “OFF” is set will be described. FIG. 8 is a flowchart illustrating the flow of erroneous connection determination processing and connection destination notification processing in the optical wavelength multiplexing system according to the fifth embodiment.

  As shown in FIG. 8, when the optical wavelength multiplexing system is activated by a user or the like (step S801), the optical wavelength multiplexing system is connected to input ports (PORT # 1 to PORT # i (maximum number of ports)). STATUS [1... I] is set to “not set” and the state of the optical switch (SW [i]) is set to “OFF” (step S802). Then, the optical wavelength multiplexing system performs the processing from steps S803 to S825, which is loop processing, from port 1 to the maximum number of ports (PORT # i) (step S803).

  Thereafter, the optical wavelength multiplexing system determines whether or not the operation state IS_OOS [i] of the corresponding input port (PORT # i) is “InService” indicating the service state (step S804).

  When the operation state IS_OOS [i] is “InService” (Yes at Step S804), the optical wavelength division multiplexing system determines whether the input state (INDOWN [i]) of the port is “InDown” indicating the ON state. Is determined (step S805).

  Subsequently, when the input state (INDOWN [i]) of the corresponding port is not “InDown” (No at Step S805), the connection state (STATUS [i]) of the corresponding PORT # i is incorrect in the optical wavelength division multiplexing system. It is determined whether or not (step S806).

  If the connection status (STATUS [i]) of the corresponding PORT # i is not an erroneous connection (No in step S806), the optical wavelength division multiplexing system has a connection status (STATUS [i]) of the corresponding input port (PORT # i). It is determined whether it is not set (step S807).

  If the connection status (STATUS [i]) of the corresponding input port (PORT # i) is not yet set (No in step S807), the optical wavelength multiplexing system increments “i” by “1”, and “i” If it is not the maximum number of ports, the above-described determination is performed for the next port (step S825).

  On the other hand, when the connection state (STATUS [i]) of the corresponding input port (PORT # i) is not set (Yes in step S807), the optical wavelength division multiplexing system switches the optical switch SW [i] connected to the corresponding input port. Is set to “ON” (step S808).

  Subsequently, the optical wavelength multiplexing system determines whether or not the input state (AMP_INDOWN) of the optical wavelength amplification unit is “InDown” (step S809).

  If the input state (AMP_INDOWN) of the optical wavelength amplification unit is “InDown” (Yes at Step S809), the optical wavelength multiplexing system notifies the maintenance person (user) of “abnormality of optical amplification unit connection” (Step S809). S810), the connection state (STATUS [1... I]) of all input ports is set to “not set”, and the optical switch (SW [1... I]) connected to all input ports is set to “OFF” (step S811). ), The process of step S825 is performed.

  On the other hand, when the input state (AMP_INDOWN) of the optical wavelength amplification unit is not “InDown” (No in step S809), the optical wavelength multiplexing system indicates that the optical input state (INDOWN) to the optical spectrum monitoring unit of the transmission side optical wavelength multiplexing device is It is determined whether it is “InDown” (step S812).

  Then, when it is determined that the optical input state (INDOWN) to the optical spectrum monitoring unit is “InDown” (Yes in step S812), the optical wavelength division multiplexing system notifies the maintenance person (user) “optical spectrum monitoring unit connection”. Notification processing for notifying “abnormal” is performed (step S813), and processing subsequent to step S811 is performed.

  On the other hand, when it is determined that the optical input state (INDOWN) to the optical spectrum monitoring unit is not “InDown” (No in step S812), the optical wavelength multiplexing system determines that the operating wavelength state λ [i] of the corresponding input port Comparison with the wavelength (λx) from the spectrum monitoring unit is performed (step S814).

  If λ [i] and [λx] match (Yes in step S814), the optical wavelength multiplexing system sets the connection state (STATUS [i]) of the corresponding input port to “normal” (step S815), and notifies the maintenance person A notification process for notifying that “the corresponding input port PORT # i is normal” is performed, and the process of step S825 is performed.

  On the other hand, if λ [i] and [λx] do not match (No in step S814), the optical wavelength multiplexing system sets the connection state (STATUS [i]) of the corresponding input port to “wrong connection” (step S817). .

  Thereafter, the optical wavelength multiplexing system compares the operating wavelength (λn) of the input port (n) (n = 1... PORT_MAX (maximum number of ports)) with the wavelength [λx] from the optical spectrum monitoring unit. (Steps S818 to S820).

  When the operating wavelength (λn) matches the wavelength [λx] (Yes at step S819), the optical wavelength multiplexing system notifies the maintenance person of “corresponding input port (PORT # i) connection destination port (PORT # n)”. The notification process is performed (step S821), the optical switch (SW [i]) to be connected is turned “OFF” (step S824), and the process of step S825 is performed.

  On the other hand, if the operating wavelength (λn) and the wavelength [λx] do not match (No in step S819), the optical wavelength multiplexing system notifies the maintenance person that “the corresponding input port (PORT # i) connection wavelength (λx) is an operating wavelength error. Is notified (step S822), the optical switch (SW [i]) to be connected is turned OFF (step S824), and the process of step S825 is performed.

  Returning to step S806, if the connection status (STATUS [i]) of the corresponding PORT # i is an incorrect connection (Yes in step S806), the optical wavelength multiplexing system turns off the connected optical switch (SW [i]). (Step S824), and the process of step S825 is performed.

  Similarly, returning to step S805, if the input state (INDOWN [i]) of the corresponding port is “InDown” (Yes in step S805), the optical wavelength division multiplexing system switches the connected optical switch (SW [i]). “OFF” is set (step S824), and the process of step S825 is performed.

  On the other hand, returning to step S804, if the operation state IS_OOS [i] is not “InService” (No in step S804), the optical wavelength multiplexing system sets the connection state (STATUS [i]) of the input port to “not set” ( Step S823), the processing after step S824 is performed.

  In the process of step S825, “i” is incremented by “1”, and the processes of steps S804 to S824 are performed until “i” reaches the maximum number “n”, and “i” is the maximum number “n”. ”, The optical wavelength multiplexing system ends the process.

  As described above, according to the fifth embodiment, when an erroneous connection is detected, the optical switch connected to the port is controlled so as not to input the converted optical signal to the optical coupler. In this case, it is possible to prevent optical signals having wavelengths input erroneously from being mixed. As a result, it is possible to prevent quality degradation of multiplexed optical signals and the optical wavelength multiplexing system.

  For example, when an optical switch or VOA is used as the optical signal switching means, an optical signal with an erroneously input wavelength also passes through the optical switch, and an erroneous optical signal is mixed by the optical signal multiplexing means. Since optical signals are switched, the optical signal switching means connected to the erroneously connected ports is stopped to prevent mixing of optical signals with wavelengths that are input incorrectly. As a result, it is possible to prevent quality degradation of the multiplexed optical signal and the optical wavelength multiplexing system.

  Further, according to the fifth embodiment, when an erroneous connection is detected, a predetermined wavelength set for each of the plurality of ports is searched, and a normal connection destination of the optical wavelength conversion unit erroneously connected to the port As the port is detected, not only the erroneous connection can be detected, but also the port that should be connected normally can be specified. As a result, the burden on the user when the erroneous connection occurs is reduced and a quick response is made. Is possible.

  For example, when the wavelengths λ1 to λ5 are set for the ports 1 to 5 and the optical fiber cable of λ3 is connected to the port 2 by mistake, not only the port 2 is detected to be erroneously connected but also the port 2 As a result of being able to identify and notify the user that the connection destination of the fiber optic cable connected in error is port 3, it is possible to reduce the burden on the user when an erroneous connection occurs and to quickly Is possible.

  Although the embodiments of the present invention have been described so far, the present invention may be implemented in various different forms other than the embodiments described above. Therefore, as shown below, different embodiments will be described by dividing into (1) the number of ports and (2) the system configuration.

(1) Number of ports For example, in the first to fifth embodiments, the case where the number of ports of the optical wavelength division multiplexing system has three ports has been described, but the present invention is not limited to this. May have two ports. There is no limit to the number of ports. Also, as many optical wavelength converters connected to each port as the number of ports may be connected, and one optical wavelength converter may be connected to a plurality of ports. When connected to multiple ports, different wavelengths are set for each port, so the optical wavelength converter has multiple optical wavelengths set, and each port converts the optical signal to a different wavelength. Will be entered.

(2) System Configuration The components of the illustrated devices are functionally conceptual and need not be physically configured as illustrated. In other words, the specific form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. They can be configured in an integrated manner (for example, the optical level monitoring control unit is divided into an input control unit and an erroneous connection detection unit). Further, all or any part of each processing function performed in each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware by wired logic.

  In addition, among the processes described in the present embodiment, all or part of the processes described as being automatically performed (for example, the amplification process or the separation process of the multiplexed optical signal) may be manually performed. Alternatively, all or part of the processing described as being performed manually (for example, processing for setting the wavelength in the port) can be automatically performed by a known method. In addition, the processing procedures, control procedures, specific names, and information including various data and parameters (for example, FIG. 3) shown in the above documents and drawings are arbitrarily changed unless otherwise specified. be able to.

(Supplementary note 1) A plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal are connected to a plurality of ports that have a predetermined wavelength set in advance. An optical wavelength that generates and transmits a multiplexed optical signal obtained by multiplexing the converted optical signals generated by the plurality of optical wavelength converters, and separates the received multiplexed optical signal for each predetermined wavelength. A multi-system,
A plurality of first optical power level detection means connected to each of the plurality of ports and detecting an optical power level of the converted optical signal input to each of the ports;
Optical signal multiplexing means for multiplexing all the converted optical signals input from the plurality of ports to generate a multiplexed optical signal;
A plurality of input means that are provided in the plurality of ports and that input the converted optical signals input to the ports to the optical signal multiplexing means;
Controlling the input means so that the converted optical signal is not input to the optical signal multiplexing means until the converted optical power level is detected by the first optical power level detecting means; When the optical power level after the conversion is detected by the optical power level detection means, the input control means for controlling the input means to input the converted optical signal to the optical signal multiplexing means,
Second optical power level detection means for detecting the optical power level after multiplexing the predetermined wavelength set in each port from the multiplexed optical signal;
The optical power level after conversion detected by the first optical power level detection means is compared with the optical power level after multiplexing detected by the second optical power level detection means, and the comparison result is obtained. When there is a difference, an erroneous connection detection unit that detects that an optical wavelength conversion unit that converts to a wavelength different from the predetermined wavelength set in each port is erroneously connected;
An optical wavelength multiplexing system comprising:

(Additional remark 2) It further has the optical branching means which branches the multiplexed optical signal multiplexed by the said optical signal multiplexing means,
The second optical power level detection means detects the optical power level after branching of the predetermined wavelength set in each port from the optical signal after branching by the optical branching means,
The erroneous connection detection means compares the converted optical power level detected by the first optical power level detection means with the optical power level after branching detected by the second optical power level detection means. In addition, when there is a difference in the comparison result, it is detected that an optical wavelength conversion unit that converts the wavelength to a wavelength different from the predetermined wavelength set in each port is erroneously connected. 2. An optical wavelength division multiplexing system according to 1.

(Supplementary Note 3) Optical branching means for branching the multiplexed optical signal multiplexed by the optical multiplexing means;
A multiplexed optical signal separating means for separating the multiplexed optical signals branched by the optical branching means for each of predetermined wavelengths set in the plurality of ports,
The second optical power level detection means detects an optical power level after separation of a predetermined wavelength set in each port from the optical signal separated by the multiplexed optical signal separation means,
The erroneous connection detection means compares the converted optical power level detected by the first optical power level detection means with the separated optical power level detected by the second optical power level detection means. In addition, when there is a difference in the comparison result, it is detected that an optical wavelength conversion unit that converts the wavelength to a wavelength different from the predetermined wavelength set in each port is erroneously connected. 2. An optical wavelength division multiplexing system according to 1.

(Additional remark 4) The said misconnection detection means receives the post-reception optical power level after the received multiplexed optical signal is separated for every said predetermined wavelength in the receiving side apparatus of the said multiplexed optical signal The received optical power level after reception and the optical power level after conversion detected by the first optical power level detection means, and when each of the ports has a difference in the comparison result, The optical wavelength division multiplexing system according to appendix 1, wherein an optical wavelength conversion unit that converts the wavelength to a wavelength different from the predetermined wavelength set is detected as being erroneously connected.

(Supplementary Note 5) In the plurality of input units, an attenuation amount with respect to the input optical signal is arbitrarily set, and the optical power level of the input optical signal is attenuated according to the set attenuation amount and input to the optical signal multiplexing unit To do,
The input control means sets the attenuation amount of the input means to a maximum until the converted optical power level is detected by the first optical power level detection means, and the first optical power level When the optical power level after the conversion is detected by the detection means, the attenuation amount is reduced so that the optical power level input to the optical signal multiplexing means is constant for each port. The optical wavelength division multiplexing system according to any one of appendices 1 to 4.

(Appendix 6) The input control means, when the erroneous connection is detected by the erroneous connection detection means, multiplexes the optical signal after conversion with respect to the input means connected to the port. The optical wavelength multiplexing system according to any one of appendices 1 to 5, wherein the optical wavelength multiplexing system is controlled so as not to be input to the means.

(Supplementary note 7) When the erroneous connection detection unit detects the erroneous connection, the optical wavelength erroneously connected to the port is searched by searching for the predetermined wavelength set in each of the plurality of ports. The optical wavelength division multiplexing system according to any one of appendices 1 to 6, wherein a normal connection destination port of the conversion unit is detected.

(Appendix 8) A plurality of optical wavelength converters that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal are connected to a plurality of ports that have a predetermined wavelength set in advance. Generating and transmitting a multiplexed optical signal obtained by multiplexing the converted optical signals generated by the plurality of optical wavelength converters, and separating the received multiplexed optical signal for each predetermined wavelength. A suitable optical wavelength multiplexing method,
A plurality of first optical power level detection steps connected to each of the plurality of ports and detecting an optical power level of the converted optical signal input to each of the ports;
An optical signal multiplexing step of multiplexing all the converted optical signals input from the plurality of ports to generate a multiplexed optical signal;
A plurality of input steps that are provided in the plurality of ports and that input the converted optical signals input to the ports into the optical signal multiplexing step;
The input process is controlled so that the converted optical signal is not input to the optical signal multiplexing process until the converted optical power level is detected by the first optical power level detection process, When the optical power level after the conversion is detected by the optical power level detection step, an input control step for controlling the input step so as to input the converted optical signal to the optical signal multiplexing step;
A second optical power level detection step of detecting an optical power level after multiplexing the predetermined wavelength set in each port from the multiplexed optical signal;
The optical power level after conversion detected by the first optical power level detection step is compared with the optical power level after multiplexing detected by the second optical power level detection step. When there is a difference, an erroneous connection detection step of detecting that an optical wavelength conversion unit that converts to a wavelength different from the predetermined wavelength set in each port is erroneously connected;
An optical wavelength multiplexing method comprising:

(Supplementary note 9) A plurality of optical wavelength conversion procedures for converting an inputted input optical signal into a predetermined wavelength and generating a converted optical signal are connected to a plurality of ports having a predetermined wavelength set in advance. Generating and transmitting a multiplexed optical signal obtained by multiplexing the converted optical signals generated by the plurality of optical wavelength conversion procedures, and separating the received multiplexed optical signal for each predetermined wavelength. An optical wavelength multiplexing program to be executed by a computer,
A plurality of first optical power level detection procedures connected to each of the plurality of ports and detecting an optical power level of the converted optical signal input to each of the ports;
An optical signal multiplexing procedure for multiplexing all the converted optical signals input from the plurality of ports to generate a multiplexed optical signal;
A plurality of input procedures that are provided in the plurality of ports and that input the converted optical signals input to the ports to the optical signal multiplexing procedure;
Controlling the input procedure so that the converted optical signal is not input to the optical signal multiplexing procedure until the converted optical power level is detected by the first optical power level detection procedure; An input control procedure for controlling the input procedure to input the converted optical signal to the optical signal multiplexing procedure when the converted optical power level is detected by the optical power level detection procedure of:
A second optical power level detection procedure for detecting, from the multiplexed optical signal, an optical power level after multiplexing at a predetermined wavelength set in each port;
The optical power level after conversion detected by the first optical power level detection procedure is compared with the optical power level after multiplexing detected by the second optical power level detection procedure. When there is a difference, an erroneous connection detection procedure for detecting that an optical wavelength conversion procedure for converting to a wavelength different from the predetermined wavelength set for each port is erroneously connected;
An optical wavelength multiplexing program that causes a computer to execute the above.

  As described above, the optical wavelength multiplexing system according to the present invention includes a plurality of optical wavelength conversion units that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal. Generates and transmits a multiplexed optical signal that is connected to a plurality of ports whose wavelengths are set in advance and multiplexes the converted optical signals generated by a plurality of optical wavelength converters, and receives the received multiplexed optical signal. This is useful for separating each predetermined wavelength. In particular, it is possible to detect an erroneous connection and to reduce the cost for system construction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an overview and features of an optical wavelength multiplexing system according to a first embodiment. 1 is a block diagram illustrating a configuration of an optical wavelength multiplexing system according to a first embodiment. It is a figure which shows the example of the information memorize | stored in a memory | storage part. 6 is a flowchart illustrating a flow of erroneous connection detection processing in the optical wavelength multiplexing system according to the first embodiment. FIG. 6 is a diagram for explaining an overall configuration of an optical wavelength multiplexing system according to a second embodiment. FIG. 10 is a diagram for explaining an overall configuration of an optical wavelength multiplexing system according to a third embodiment. FIG. 10 is a diagram for explaining an overall configuration of an optical wavelength multiplexing system according to a fourth embodiment. 10 is a flowchart illustrating a flow of erroneous connection determination processing and connection destination notification processing in an optical wavelength division multiplexing system according to a fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Transmission side optical wavelength multiplexing apparatus 11 Storage part 12 Optical wavelength conversion part 13 Optical wavelength conversion part 14 Optical wavelength conversion part 20 Optical wavelength multiplexing unit 21 Port A
22 Port B
23 Port C
24 PD
25 PD
26 PD
27 Optical Switch 28 Optical Switch 29 Optical Switch 30 Optical Coupler 40 Transmission Optical Amplification Unit 41 PD
DESCRIPTION OF SYMBOLS 42 Optical branch part 43 Optical amplifier part 50 Optical spectrum monitoring part 60 Optical level monitoring control part 70 Reception side optical wavelength multiplexer 71 Storage part 72 Reception light amplification unit 73 Optical amplification part 74 Optical wavelength separation unit 75 Reception light wavelength separation part 76 PD
77 PD
78 PD
79 Port A
80 port B
81 port C
82 Optical wavelength conversion unit 83 Optical wavelength conversion unit 84 Optical wavelength conversion unit 85 Optical level monitoring unit

Claims (3)

A plurality of optical wavelength converters that convert an input optical signal that has been input into a predetermined wavelength and generate a converted optical signal are connected to a plurality of ports that have a predetermined wavelength set in advance, This is an optical wavelength multiplexing system that generates and transmits a multiplexed optical signal obtained by multiplexing the converted optical signal generated by the optical wavelength conversion unit of the optical wavelength converter, and separates the received multiplexed optical signal for each predetermined wavelength. And
Corresponding to each of the plurality of ports, set wavelength storage means for storing wavelengths set for each of the plurality of ports;
A plurality of first optical power level detection means connected to each of the plurality of ports and detecting an optical power level of the converted optical signal input to each of the ports;
Optical signal multiplexing means for multiplexing all the converted optical signals input from the plurality of ports to generate a multiplexed optical signal;
A plurality of input means that are provided in the plurality of ports and that input the converted optical signals input to the ports to the optical signal multiplexing means;
Controlling the input means so that the converted optical signal is not input to the optical signal multiplexing means until the converted optical power level is detected by the first optical power level detecting means; When the optical power level after the conversion is detected by the optical power level detection means, the input control means for controlling the input means to input the converted optical signal to the optical signal multiplexing means,
Second optical power level detection means for detecting the optical power level after multiplexing the predetermined wavelength set in each port from the multiplexed optical signal;
The optical power level after conversion detected by the first optical power level detection means is compared with the optical power level after multiplexing detected by the second optical power level detection means, and the comparison result is obtained. when the difference occurs, to identify the port to which differences the same wavelength as the corresponding wavelength to the optical power level after multiplexing ports occurring is set from the setting wavelength storing means, the specific port Erroneous connection detection means for notifying as a correct connection destination of the optical wavelength conversion unit connected to the port where the difference occurs ,
An optical wavelength multiplexing system comprising:   In the case where there is a difference in the comparison result, the erroneous connection detection unit determines the wavelength stored in the set wavelength storage unit in association with the port in which the difference is generated, as the second optical power level. 2. The optical wavelength multiplexing system according to claim 1, wherein the wavelength is changed to a wavelength corresponding to the optical power level after multiplexing of the ports where the difference detected by the detecting means is generated. In the plurality of input means, an attenuation amount with respect to the input optical signal is arbitrarily set, and the optical power level of the input optical signal is attenuated and input to the optical signal multiplexing means in accordance with the set attenuation amount. And
The input control means sets the attenuation amount of the input means to a maximum until the converted optical power level is detected by the first optical power level detection means, and the first optical power level If the optical power level after conversion detected by the detecting means and the multiplexed optical power level detected by the second optical power level detecting means do not differ, the erroneous connection detection 3. The optical wavelength division multiplexing system according to claim 1, wherein the attenuation is decreased so that the optical power level input to the optical signal multiplexing unit becomes constant when determined by the unit. .

Images